The January Digital Edition Is Available Today
Each issue includes technical content from Underhood Service.
Cabin Air Filter Replacement
There are three major reasons to replace a cabin air filter in the winter.
The December Digital Edition Is Available Today
Each issue includes technical content from Underhood Service.
Today’s Fuel Pressure Diagnostics
Direct injection pressure is measured with sensors, and you’ll need a scan tool to measure the signals
Acura Turbo Engine Service
It is important to check the operation of the solenoids that control vacuum to the actuators.
Subaru EJ25 Head Gasket Problems
Most of the EJ head gasket failures occur around the 100,000-mile mark and start as a slow oil or coolant leak.
Ignition Systems
The ignition coil is a very simple and robust circuit.
HV/EV Battery Pack Replacements
It is difficult to say when a battery pack will need to be replaced.
Diagnosing Crankshaft Position Sensors
Modern engines need to know the position of the crankshaft and camshafts.
Electronic Throttle Body Service
On most systems, idle speed is completely controlled by the throttle plate angle.
Cabin Air Filters
Don’t overlook the importance of the cabin air filter in your customers’ vehicles.
Being More Motivated
Set and reach your goals together.
